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mobile: Change the unit from px to dp on Android (#241)

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This commit is contained in:
Hajime Hoshi 2016-07-03 05:37:56 +09:00
parent 83e24f6d48
commit 0e2a1a1636
2 changed files with 60 additions and 5 deletions
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59
internal/ui/ui_android.go
View File

@ -14,6 +14,61 @@
package ui
func deviceScale() float64 {
return 1
/*
#include <jni.h>
#include <stdlib.h>
// Basically same as `getResources().getDisplayMetrics().density`;
static float deviceScale(uintptr_t java_vm, uintptr_t jni_env, uintptr_t ctx) {
JavaVM* vm = (JavaVM*)java_vm;
JNIEnv* env = (JNIEnv*)jni_env;
jobject context = (jobject)ctx;
const jclass android_content_ContextWrapper =
(*env)->FindClass(env, "android/content/ContextWrapper");
const jclass android_content_res_Resources =
(*env)->FindClass(env, "android/content/res/Resources");
const jclass android_util_DisplayMetrics =
(*env)->FindClass(env, "android/util/DisplayMetrics");
const jobject resources =
(*env)->CallObjectMethod(
env, context,
(*env)->GetMethodID(env, android_content_ContextWrapper, "getResources", "()Landroid/content/res/Resources;"));
const jobject displayMetrics =
(*env)->CallObjectMethod(
env, resources,
(*env)->GetMethodID(env, android_content_res_Resources, "getDisplayMetrics", "()Landroid/util/DisplayMetrics;"));
const float density =
(*env)->GetFloatField(
env, displayMetrics,
(*env)->GetFieldID(env, android_util_DisplayMetrics, "density", "F"));
return density;
}
*/
import "C"
import (
"fmt"
"github.com/hajimehoshi/ebiten/internal/jni"
)
var (
androidDeviceScale = 0.0
)
func deviceScale() float64 {
if 0 < androidDeviceScale {
return androidDeviceScale
}
if err := jni.RunOnJVM(func(vm, env, ctx uintptr) error {
androidDeviceScale = float64(C.deviceScale(C.uintptr_t(vm), C.uintptr_t(env), C.uintptr_t(ctx)))
return nil
}); err != nil {
panic(fmt.Sprintf("ui: error %v", err))
}
return androidDeviceScale
}

6
mobile/mobile.go
View File

@ -22,9 +22,7 @@ import (
//
// Different from ebiten.Run, this invokes only the game loop and not the main (UI) loop.
//
// On Android, width/height is in pixels (px).
//
// On iOS, width/height is in points.
// The unit of width/height is device-independent pixel (dp on Android and pointer on iOS).
func Start(f func(*ebiten.Image) error, width, height int, scale float64, title string) error {
return start(f, width, height, scale, title)
}
@ -54,6 +52,8 @@ func Update() error {
// }
// return true;
// }
//
// The coodinate x/y is in dp.
func UpdateTouchesOnAndroid(action int, id int, x, y int) {
updateTouchesOnAndroid(action, id, x, y)
}